CN104459348B - High power microwave radiation field measurement device and its method based on software radio - Google Patents

Abstract

The invention discloses a kind of high power microwave radiation field measurement device based on software radio and its method, the device includes：Reception antenna, attenuator, frequency converter, A/D converter and data terminal, data terminal include receiver module, software detection module, data processing module and output module；Wherein, reception antenna, decay link, frequency converter, A/D converter and data terminal are sequentially connected in series；Receiver module in data terminal is electrically connected with A/D converter, and receiver module, software detection module, data processing module and output module are sequentially connected in series.The L-band software wave detector of design, sensitivity dynamic range about 30dB, detecting circuit 10mV~700mV are invented, the response time is less than 1ns, and repeatability and stability are high, not by temperature and environment electromagnetics interference effect.

Description

High Power Microwave Radiation Field Measuring Device and Method Based on Software Radio

technical field

The invention relates to the technical field of high-power microwave measurement, in particular to a software radio-based high-power microwave radiation field measurement device and method thereof.

Background technique

High-power microwave refers to strong electromagnetic radiation with a frequency range from 300MHz to 300GHz and a peak power greater than 100MW or an average power greater than 1MW. High-power microwaves have important applications in the fields of radar, communication, nuclear fusion heating, material processing, and directed energy.

Radiation field measurement is the main means to obtain the technical specifications of high-power microwave systems. However, due to the high peak power, short pulse time, and complex measurement environment of high-power microwave radiation fields, accurate measurement of radiation field power has always been a technical problem. The basic idea of the current high-power microwave radiation field measurement is to attenuate the high-power microwave received by the antenna to low power for detection, determine the input power of the detector according to the waveform recorded by the oscilloscope and the sensitivity curve of the detector, and then combine the attenuation of the attenuation link of the measurement system Calculate the microwave power received by the measurement system.

The detector is the core device of the high-power microwave radiation field measurement system, and its main body is a microwave diode. Currently, the surface-contact Schottky barrier diode is widely used. Commonly used broadband detectors have problems such as large response time and waveform distortion caused by mismatched reflections. And as a semiconductor device, the performance of the detector is easily affected by the ambient temperature. The usual way to improve detector characteristics includes selecting better detector diodes and improving circuit design. With the increase in measurement requirements, device performance bottlenecks, and limitations in design and processing conditions, it is becoming more and more difficult to improve detector hardware performance.

The components of the radiation field measurement system are connected by hardware such as microwave cables and adapters, and the transmission is an analog signal. In a high-power microwave environment, it is susceptible to interference, and the electromagnetic protection requirements for each link are relatively high. The common means of electromagnetic protection include shielding, filtering, grounding and laying absorbing materials, etc. These measures often bring problems such as system complexity and reduced reliability.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a software radio-based high-power microwave radiation field measurement device and its method, aiming to solve the problem that the high-power microwave radiation field measurement is affected by the performance change of the detector in a complex measurement environment. As a result, it is convenient to realize the measurement of parameters such as pulse microwave power and pulse width to be measured.

To achieve the above object, the present invention adopts the following technical means:

A high-power microwave radiation field measurement device based on software radio, including:

The receiving antenna is used to receive the pulsed microwave signal to be measured;

an attenuator, used to reduce the power of the microwave signal to be measured;

The frequency converter is used for frequency conversion of the carrier frequency of the microwave signal to be measured;

The A/D converter is used to convert the analog signal of the microwave signal to be measured into a digital signal;

Data terminal, used for software detection and data calculation of digital signals, including:

The receiving module is used for receiving and conditioning the digital signal converted by the A/D converter;

The software detection module is used to receive digital signal data and perform software detection;

The data processing module is used to process the detection signal through waveform conditioning and parameter calculation;

The output module displays the waveforms and parameters obtained by the data processing module in the form of charts;

Among them, the receiving antenna, attenuator, frequency converter, A/D converter and data terminal are sequentially connected in series; the receiving module in the data terminal is connected to the A/D converter, and the receiving module, software detection module, data processing module and output module sequentially connected in series.

Described software detection module comprises:

The filter module is used to suppress the interfering signal outside the frequency band of the conditioned digital signal;

The rectifier module is used to process the received digital signal by simulating the unidirectional conducting action of the detection diode;

The secondary filter module is used for secondary suppression of the interference signal in the digital signal processed by the rectifier module;

Wherein, the filtering module is connected with the receiving module, the filtering module, the rectifier module and the secondary filtering module are sequentially connected in series, and the secondary filtering module is connected with the data processing module.

The software detection module also includes:

The signal detection and analysis module is used to compare and analyze the output signals of the receiving module, filter module, rectifier module and secondary filter module, and optimize the overall index performance of the software detector by adjusting the parameters of each module;

Wherein, the output ends of the receiving module, the filtering module, the rectifier module and the secondary filtering module are all connected to the signal detection and analysis module.

Described data processing module comprises:

The waveform conditioning module is used to perform noise reduction, smoothing or scaling processing on the detection signal, and convert the signal after software detection into a time-domain envelope waveform;

The parameter calculation module is used to convert the detection voltage amplitude into radiation field power parameters and power density parameters;

Wherein, the waveform conditioning module and the parameter calculation module are arranged in parallel.

The frequency converter is a frequency mixer, frequency divider or frequency multiplier.

The measurement method using the high-power microwave radiation field measurement device based on software radio includes the following steps:

1) After the pulsed microwave signal to be measured is received by the antenna, the power of the pulsed microwave signal to be measured is reduced to the processing power range of the frequency converter or A/D converter through the attenuator;

2) When the analog bandwidth of the A/D converter is more than 3 to 5 times the pulse microwave carrier frequency, proceed to step 3) directly;

When it is not satisfied that the analog bandwidth of the A/D converter is more than 3 to 5 times the carrier frequency of the pulsed microwave, use a frequency converter to perform frequency conversion on the carrier frequency of the pulsed microwave signal to be measured after the power is reduced, and then perform step 3);

3) Utilize the A/D converter to convert the collected pulsed microwave signal to be measured or the analog signal of the pulsed microwave signal to be measured after frequency conversion by a frequency converter into a digital signal;

4) Use the data terminal to receive digital signal data and perform software detection, and then perform data processing, convert the signal after software detection into a time-domain envelope waveform, and obtain the radiation field power parameters and power density parameters, and convert the time-domain envelope waveform , radiation field power parameters and power density are displayed in the form of graphs.

Described software detection step comprises the following steps:

The receiving module adjusts the digital signal converted by the A/D converter, suppresses the interference signal outside the frequency band through the filter module, and then transmits the digital signal through the one-way conduction of the quasi-detection diode of the rectifier module, and then passes through the filter module to suppress the interference signal The signal is suppressed twice, and the signal after software detection is processed again.

The described data processing steps include the following steps:

The waveform conditioning module converts the signal after software detection into a time-domain envelope waveform through noise reduction, smoothing or scaling processing; at the same time, the parameter calculation module calculates the relationship between the voltage signal obtained by software detection and the sensitivity function to obtain the input power, and then through the attenuation The attenuation value of the antenna and the effective area parameters of the antenna are comprehensively calculated to obtain the radiation field power and power density.

The described software detection step also includes the following steps:

Use the signal detection and analysis module to compare and analyze the output signals of the receiving module, filter module, rectifier module and secondary filter module, compare the input and output waveform amplitude, edge time and waveform distortion of each module, and adjust the parameters of each module To optimize the overall index performance of the software detector.

The frequency converter, A/D converter and data terminal need to be tested for sensitivity and response time parameters before being used for radiation field measurement. The power at the front end of the inverter is monitored, and the sensitivity function relationship is obtained by fitting the input power of the inverter and the detection voltage data output by the data terminal.

Compared with the prior art, the present invention has the following advantages:

The present invention is a high-power microwave radiation field measurement device based on software radio, which uses an A/D converter to convert the pulsed microwave signal to be measured into a digital signal, and realizes functions such as filtering, wave detection, and data processing through software, without hardware filters And the detector can obtain the pulse microwave power value and waveform parameters to be tested. The measurement device can effectively improve the influence of the performance change of the hardware detector on the power measurement results, and is suitable for accurate measurement of high-power microwaves in the field with large signal dynamic range, fast edge time, large ambient temperature changes, and high requirements for repeat stability.

(1) Large dynamic range. At present, the sensitivity dynamic range of commonly used commercial geophones is within 20dB, the receiving power range of software geophones is -20dBm～10dBm, and the dynamic range is about 30dB. Generally, the sensitivity dynamic range of a hardware detector depends on parameters such as the input power, breakdown power, output efficiency, and circuit structure of the detector diode, while the sensitivity dynamic range of a software detector only depends on the performance of its front-end hardware, and has nothing to do with its own parameter performance. Achieve a wide dynamic range.

(2) The edge time is fast. The response time of the hardware detector is about 3ns, and the signal waveform of the software detector basically fits the original signal envelope, and the response time is <1ns. The response time of a general hardware detector depends on the performance of the detector diode and circuit design. At present, the fastest response time of commercial detectors is about 2ns.

(3) Stable performance. As a semiconductor device, the performance of the hardware detector is easily affected by the ambient temperature, and its stability gradually changes with the increase of usage time. The performance parameters of the filter, rectifier and connection port in the software detector are only related to the design algorithm, not related to hardware performance, not affected by temperature changes, and have high repeat stability.

Description of drawings

Figure 1 is a block diagram of commonly used high-power microwave radiation field measurement devices;

Figure 2 is a block diagram of the high-power microwave radiation field measurement device based on software radio;

Figure 3 is a connection diagram of the internal modules of the data terminal;

Fig. 4 is a test block diagram of the software detector at low and medium power;

Figure 5 is a typical waveform of a radiation field measurement device based on software radio, Figure 5a is a waveform diagram of pulsed microwave detection to be tested, and Figure 5b is a waveform diagram of software detection;

Fig. 6 a is the sensitivity function curve of the hardware detector, and Fig. 6 b is the sensitivity function curve of the software detector;

Fig. 7 a is the response time graph of hardware detector; Fig. 7 b is the response time graph of software detector;

Figure 8 shows the temperature characteristics of the hardware detector.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, it is a high-power microwave radiation field measurement device commonly used in the prior art, which is mainly composed of a receiving antenna, an attenuation link, a detector, an oscilloscope, and the like.

Referring to Fig. 2, it is a high-power microwave radiation field measurement device based on software radio according to the present invention. The device is mainly composed of a receiving antenna, an attenuation link, a frequency converter, and a data terminal. Figure 3 shows the internal modules of the data terminal (computer, DSP, etc.), including a software detector and a data processor. The software detector is mainly composed of a data receiving module, an input filter module, a rectifier module, an output filter module, a signal detection and analysis module, It consists of a data output module and the like; the data processor includes a waveform conditioning module and a parameter calculation module. The receiving antenna is used to receive the pulsed microwave signal to be measured; the attenuator is used to reduce the power of the microwave signal to be measured to the processing power range of the frequency converter or A/D converter; the frequency converter is used to control the microwave signal to be measured The carrier frequency is used for frequency conversion; the A/D converter is used to convert the analog signal of the microwave signal to be tested into a digital signal; the data terminal is used for software detection and data calculation of the digital signal, including: receiving module for receiving A The digital signal converted by the /D converter is adjusted; the software detection module is used to receive the digital signal data and perform software detection; the data processing module is used to convert the waveform and parameters to the chart after the detection signal is adjusted by the waveform and calculated. Display in the form; output module, output waveform conditioning module processed detection signal diagram and parameter calculation module calculated radiation field power parameters and power density parameters; receiving antenna, attenuation link, frequency converter, A/D converter and data terminal connected in series in sequence; the receiving module in the data terminal is electrically connected to the A/D converter, and the receiving module, software detection module, data processing module and output module are connected in series in sequence.

The software detection module includes: a filter module, which is used to suppress the interference signal outside the middle frequency band of the conditioned digital signal; a rectifier module, which is used to process the received digital signal by simulating the unidirectional conduction of the detection diode; a secondary filter module, It is used for secondary suppression of the interference signal in the digital signal processed by the rectifier module; the filter module is connected to the receiving module, the filter module, the rectifier module and the secondary filter module are connected in series in sequence, and the secondary filter module is connected to the data processing module.

The software detection module also includes: a signal detection and analysis module, which is used to compare and analyze the output signals of the receiving module, filter module, rectifier module and secondary filter module, and optimize the overall index performance of the software detector by adjusting the parameters of each module ; The output ends of the receiving module, the filtering module, the rectifier module and the secondary filtering module are all connected to the signal detection and analysis module.

The data processing module includes: a waveform conditioning module, which is used to perform noise reduction, smoothing or scaling processing on the detection signal, and convert the signal after software detection into a time-domain envelope waveform; a parameter calculation module, which is used to convert the detection voltage amplitude are the radiation field power parameters and power density parameters; the output of the secondary filtering module of the software detection module is divided into two paths, which are respectively connected to the waveform conditioning module and the parameter calculation module, and the outputs of the waveform conditioning module and the parameter calculation module are both connected to the output module.

Among them, the rectifier module is used to simulate the function of the detection diode to rectify, that is, forward conduction and reverse cutoff, so that only positive voltage of the input signal can pass through. The capacitor and resistor at the back end of the detection diode form an RC filter, which filters out the leaked high-frequency signal to obtain the signal envelope voltage. At the same time, the RC circuit also has the function of adjusting the output amplitude.

The software detector structure designed by MATLAB and Simulink. The waveform data collected by the oscilloscope is input into the program, and the program successively passes high-pass filtering to filter out low-frequency interference signals, and then rectifies the signal, and the rectified signal is fed into a low-pass filter to filter out high-frequency noise and then output. Get the detection voltage. The high-pass filter adopts Butterworth type, the cut-off frequency is 0.5GHz, the stop-band loss is 30dB, and the insertion loss fluctuation in the pass-band is 0.01dB. Rectification is to make the forward conduction and reverse cut-off, and the absolute value function is used in the software detector to replace it. The rectified signal enters the low-pass filter, which also adopts Butterworth type, the cut-off frequency is 1GHz, the insertion loss fluctuation in the passband is 0.01dB, the stopband is 1.3GHz～25GHz, and the stopband loss is 30dB.

Basic principle of the present invention: a frequency converter is set after the attenuation link, and this frequency converter (frequency mixing, frequency division, frequency multiplication, etc.) converts the frequency of the input signal into the frequency range that the A/D converter can accurately collect, A/D The D converter converts the analog signal into a digital signal, and uses a data processing terminal (computer, DSP, etc.) to perform software detection on the digital signal. The basic idea of software radio is to place the wideband A/D converter as close as possible to the radio frequency antenna, and realize various functions of the communication system through software to the greatest extent. In the present invention, the pulsed microwave signal to be tested is converted into a digital signal by using a wide-band A/D converter, and the designed software is used to realize functions such as signal filtering, wave detection, and data processing, so as to avoid the difference in performance of the wave detector hardware and at the same time It is convenient to realize the measurement of parameters such as pulse microwave power and pulse width to be measured. At the same time, because the transmission in the system is a digital signal, it not only improves the anti-interference ability, but also reduces the difficulty of system electromagnetic protection design. After the pulsed microwave signal to be tested, a broadband A/D converter (or a broadband high-speed oscilloscope) is used to realize analog-to-digital conversion. In order to reduce the performance requirements of the A/D converter, a frequency converter can be connected in front of the A/D converter.

The basic working steps of the high-power microwave radiation field measurement method based on software radio in the present invention are as follows:

1) After the high-power microwave signal is received by the antenna, the attenuation link reduces the signal power level to medium and low power, that is, it is reduced to the processing power range of the frequency converter or A/D converter.

2) The frequency converter performs frequency conversion on the carrier frequency of high-power microwave, which is convenient for A/D conversion.

3) The A/D converter converts the analog signal into a digital signal.

4) Use the data terminal to receive digital signal data and perform software detection, and then perform data processing, convert the signal after software detection into a time-domain envelope waveform, and obtain the radiation field power parameters and power density parameters, and convert the time-domain envelope waveform , radiation field power parameters and power density are displayed in the form of graphs.

Among them, the software detection step is specifically: the receiving module adjusts the digital signal converted by the A/D converter, suppresses the interference signal outside the frequency band through the filtering module, and then transmits the digital signal through the one-way conduction of the rectifier to simulate the detection diode , and then the interference signal is suppressed twice through the filter module, and the signal after software detection is processed again. In order to ensure the normal operation of the software detection, use the signal detection and analysis module to compare and analyze the output signals of the receiving module, filter module, rectifier module and secondary filter module, and analyze the input and output waveform amplitude, edge time and waveform distortion of each module. In contrast, the overall index performance of the software detector is optimized by adjusting the parameters of each module.

Among them, the data processing steps are as follows: the waveform conditioning module converts the signal after software detection into a time-domain envelope waveform through noise reduction, smoothing or scaling processing; at the same time, the parameter calculation module converts the relationship between the voltage signal obtained by software detection and the sensitivity function The input power is calculated, and then the attenuation value of the attenuation link and the effective area parameter of the antenna are comprehensively calculated to obtain the radiation field power and power density.

The sensitivity function relationship between the power of the pulsed microwave signal to be measured and the voltage amplitude is calculated according to the formula (1):

P ₀ ＝f(U)………………(1)

In the formula:

P ₀ ——Input power of geophone, W;

U——detection voltage amplitude, V;

f()——The function relationship between the input power of the detector and the output voltage.

The power received by the antenna and the power density of the radiation field at the mouth surface are calculated according to formulas (2) and (3):

P ₁ =P ₀ /a…………………(2)

P ₂ =P ₁ /A _e ……………………(3)

In the formula:

P ₀ ——Input power of geophone, W;

P ₁ ——Antenna received power, W;

P ₂ ——power density, W/m ² ;

a——path attenuation factor, a<1;

A _e ——Antenna effective receiving area, m ² ;

In addition, (1) the A/D converter is implemented by a separate A/D circuit or oscilloscope. When the analog bandwidth of the A/D converter is more than 3 to 5 times the pulse microwave carrier frequency, the pulse microwave signal can be directly Acquisition without frequency converter.

(2) The software detector is the same as the hardware detector. Before it is used for radiation field measurement, it also needs to test the sensitivity, response time and other parameters of the front-end frequency converter and A/D converter. The test is performed under low and medium power unfold, as shown in Figure 4. In this test, the signal source is used to simulate the pulsed microwave signal to be tested, and the power meter is used to monitor the power entering the front end of the inverter. The sensitivity function relationship is obtained by fitting the input power of the inverter and the detection voltage data output by the data terminal, namely: P ₀ =f(U).

Test results and analysis of the high-power microwave radiation field measuring device based on software radio in the present invention:

Referring to Fig. 4, device of the present invention is tested according to test method, utilize microwave signal source E8257D to produce 1.57GHz, the signal of pulse width 1us, carry out data acquisition with the oscilloscope of TEK70604 bandwidth 6GHz, utilize the software detector of design to carry out wave detection;

Signal source setting: E8257D, 1.57GHz, pulse width 1us, period 2us, amplitude -10dBm ~ 15dBm, step by 0.2dB. Oscilloscope settings: DPO70604, 6GHz, 25GS/s, 200ns/div, store 100000 points.

The oscilloscope collects signal waveforms and software detector waveforms. Figure 5a is a waveform diagram of the pulsed microwave detection to be tested, and Figure 5b is a waveform diagram of software detection.

Comparing Figure 6a and Figure 6b, it can be seen that the sensitivity dynamic range of commonly used commercial geophones is within 20dB, and the received power range of software geophones is -20dBm~10dBm, reaching 30dB. According to the sensitivity test results of the software detector, when the input power is -20dBm～10dBm, the output amplitude is 10mV～700mV. Generally, the sensitivity dynamic range of a hardware detector depends on parameters such as the input power, breakdown power, output efficiency, and circuit structure of the detector diode, while the sensitivity dynamic range of a software detector only depends on the performance of its front-end hardware, and has nothing to do with its own parameter performance. Achieve a wide dynamic range.

Comparing Figure 7a and Figure 7b, it can be seen that Figure 7a shows the response time of the hardware detector, which is about 3ns. Figure 7b is the software detection signal waveform, which basically fits the original signal envelope, and the response time is <1ns. The response time of a general hardware detector depends on the performance of the detector diode and circuit design. At present, the fastest response time of commercial detectors is about 2ns.

As shown in FIG. 8 , as a semiconductor device, the performance of a hardware detector is easily affected by the ambient temperature, and its stability gradually changes with increasing usage time. The performance parameters of the filter, rectifier and connection port in the software detector are only related to the design algorithm, not related to hardware performance, not affected by temperature changes, and have high repeat stability.

Therefore, the device of the present invention can effectively improve the influence of the performance change of the hardware detector on the power measurement result, and is suitable for accurate measurement of high-power microwaves in the external field with large dynamic range of signals, fast edge time, large changes in ambient temperature, and high requirements for repeat stability. . The invented and designed L-band software detector has a sensitivity dynamic range of about 30dB, a detection voltage of 10mV-700mV, a response time of less than 1ns, high repeatability and stability, and is not affected by temperature and environmental electromagnetic interference.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (10)

1. a kind of high power microwave radiation field measurement device based on software radio, it is characterised in that：Including：

Reception antenna, for receiving pulsed microwave signals to be measured；

Attenuator, for the power of pulsed microwave signals to be measured to be reduced；

Frequency converter, frequency transformation is carried out for the carrier frequency to pulsed microwave signals to be measured；

A/D converter, for the analog signal of pulsed microwave signals to be measured to be converted into data signal；

Data terminal, calculates for carrying out software detection and data to data signal, including：

Receiver module, for receiving the data signal after A/D converter is changed and being nursed one's health；

Software detection module, for receiving digital signal data and carrying out software detection；

Data processing module, for rectified signal to be calculated by waveform conditioning and parameter；

Output module, the waveform and parameter that data processing module is obtained graphically is shown；

Wherein, reception antenna, attenuator, frequency converter, A/D converter and data terminal are sequentially connected in series；In data terminal Receiver module is connected with A/D converter, and receiver module, software detection module, data processing module and output module are sequentially connected in series Connection.

2. the high power microwave radiation field measurement device based on software radio according to claim 1, it is characterised in that： Described software detection module includes：

Filtration module, for the interference signal outside the data signal midband after conditioning to be suppressed；

Rectifier module, the one-way conduction effect for simulating detector diode processes the data signal for receiving；

Secondary filtering module, for processing rectifier module after data signal in interference signal carry out secondary suppression；

Wherein, filtration module is connected with receiver module, and filtration module, rectifier module and secondary filtering module are sequentially connected in series company Connect, secondary filtering module is connected with data processing module.

3. the high power microwave radiation field measurement device based on software radio according to claim 2, it is characterised in that： Described software detection module also includes：

Signal detection and analysis module, for the output to receiver module, filtration module, rectifier module and secondary filtering module Signal is analyzed, by adjusting the parameter of each module come the global index performance of optimization software detection module；

Wherein, receiver module, filtration module, rectifier module and secondary filtering module output end and signal detection and analysis Module is connected.

4. the high power microwave radiation field measurement device based on software radio according to claim 1, it is characterised in that： Described data processing module includes：

Waveform conditioning module, for carrying out noise reduction, the treatment of smooth or scaling to rectified signal, by the signal conversion after software detection It is temporal envelope waveform；

Parameter calculating module, for detecting circuit amplitude to be scaled into radiation field power parameter, power density parameter；

Wherein, waveform conditioning module is arranged in parallel with parameter calculating module.

5. the high power microwave radiation field measurement device based on software radio according to claim 1, it is characterised in that： Described frequency converter is frequency mixer, frequency divider or frequency multiplier.

6. the measurement side of the high power microwave radiation field measurement device based on software radio described in a kind of use claim 1 Method, it is characterised in that：Comprise the following steps：

1) after pulsed microwave signals to be measured are received by antenna, the pulsed microwave signals power to be measured is reduced to by change by attenuator In the range of the processing power of frequency device or A/D converter；

2) when the analog bandwidth of A/D converter is more than 5 times of pulse microwave carrier frequency, step 3 is directly carried out)；

When it is more than 5 times of pulse microwave carrier frequency to be unsatisfactory for the analog bandwidth of A/D converter, using frequency converter to reducing power The carrier frequency of pulsed microwave signals to be measured afterwards carries out step 3 after carrying out frequency transformation)；

3) using A/D converter by gather pulsed microwave signals to be measured or the arteries and veins to be measured after frequency converter carries out frequency transformation The analog signal for rushing microwave signal is converted to data signal；

4) receive digital signal data using data terminal and carry out software detection, then carry out data processing, after software detection Signal be converted to temporal envelope waveform, and radiation field power parameter and power density parameter are obtained, by temporal envelope waveform, spoke Penetrate a power parameter and power density is graphically shown.

7. use according to claim 6 is based on the measurement side of the high power microwave radiation field measurement device of software radio Method, it is characterised in that：Described software detection step is comprised the following steps：

Data signal after receiver module changes A/D converter is nursed one's health, and filtered module is to out-of-band interference signal Suppressed, then intended the one-way conduction action transport data signal of detector diode, then mould after filtering by rectifier module Block carries out secondary suppression to interference signal, and the signal after software detection carries out data processing again.

8. use according to claim 6 is based on the measurement side of the high power microwave radiation field measurement device of software radio Method, it is characterised in that：Described data processing step is comprised the following steps：

Signal after software detection is converted to temporal envelope ripple by waveform conditioning module after noise reduction, smooth or scaling are processed Shape；The voltage signal that parameter calculating module obtains software detection simultaneously is calculated input work with the relation of sensitivity function Rate, then comprehensive computing is carried out by attenuator attenuation value and antenna effective area parameter, obtain radiation field power and power is close Degree.

9. use according to claim 6 is based on the measurement side of the high power microwave radiation field measurement device of software radio Method, it is characterised in that：Described software detection step is further comprising the steps of：

Receiver module, filtration module, rectifier module and secondary filtering module are exported using signal detection and analysis module is believed Number it is analyzed, the input of each module and output waveform amplitude, edge time and wave distortion is contrasted, by adjustment The parameter of each module carrys out the global index performance of optimization software detection module.

10. the measurement using the high power microwave radiation field measurement device based on software radio according to claim 6 Method, it is characterised in that：Described frequency converter, A/D converter and data terminal are before for radiation field measurement, it is necessary to carry out Sensitivity and the test of response time parameter, the test simulate pulsed microwave signals to be measured using signal source, and power meter is to entering The power for entering frequency converter front end is monitored, and intends by the detecting circuit data that frequency converter input power and data terminal are exported Conjunction obtains sensitivity function relation.